Putting comuters in standby issue

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I run 2 machines with Asus A8V motherboards. If I put one machine in
standby mode all power in system seems to go off and power indicator
flashes no fans run including CPU fan and disk power light in
removable Drive tray goes out indicating no power to drive. Movement
of mouse brings it out of standby as required.

The other A8V when put in standby does as other systems I have do and
goes into standby but everything stays powered in machine all fans
spin and hard drive is powered.

Bios were  compared and all settings are identical.  Any clues as to
why this  difference in the two machines?

ASUS A8V/Athlon FX-55
1GB OCZ Gold Edition Rev3 DDR PC-3700

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